<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script>
			function a(){
				
				//b是a的私有函数
				function b(){
				   
				     function c(){
				     	
				     }
				     c();
				}
				b();
			}
			
			a(); //公共函数
		</script>
	</head>
	<body>
	</body>
</html>
